POLYMER DEGRADATION AND STABILITY
·
2015
·
IF 3.163
De-Ming Guo,Xiang-Quan Chen,Liang Tang,Jia-Ning Wu,Teng Fu,Xiao-Lin Wang,Xiu-Li Wang,Li Chen,Yu-Zhong Wang
In order to avoid potential environmental and safety problems caused by conventional flame retardants , we synthesized the flame-retardant-element-free copolyesters via chemically incorporating the structural units of bisphenol A and bisphenol F into the PET main chain via melt polymerization, respectively. The chemical structures of resulting copolyesters were confirmed by 1 H NMR and 13 C NMR spectroscopy. Interestingly, though there exists only a small structural difference between bisphenol A and bisphenol F, those two kinds of copolyesters show different thermal stabilities, pyrolysis behaviours and flame retardant performances. Pyrolysis-GC/MS tests were performed to investigate the pyrolysis mechanism of the copolyesters, and the results showed that the “Ar–CH 2 –Ar” structure units (bisphenol F) would lead to rearrangement reactions at high temperature, ultimately forming the phenanthrene ring structures; whereas “Ar–C(CH 3 ) 2 −Ar” structure units (bisphenol A) could not. The corresponding specific pyrolysis processes are proposed. Thermogravimetric analysis (TGA) results indicated that these rearrangement reactions would most likely occur in the solid state of the copolyesters and made them have high residues. Cone calorimeter measurements, LOI and vertical UL-94 tests were used to characterize the flame-retardant properties of the copolyesters, and the results proved that the copolyesters containing bisphenol F had better flame retardancy, more char formation and less melt drippings than those containing bisphenol A due to the rearrangement reactions.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yulu Liu,Minghui Zan,Lei Cao,Jiahui Peng,Panyong Wang,Xinpei Pang,Yan Zhang,Li Li,Qian Mei,Wen-Fei Dong
As a kind of common colorant, new coccine has been applied in many scenes of daily life. In this study, innovative F-doped silicon quantum dots (F-SiQDs) which prepared by a facile one-step hydrothermal treatment were designed for the detection of new coccine. Systematic studies demonstrate that the obtained F-SiQDs exhibited excellent dispersibility and photostability, with the optimal emission at 475 nm and fluorescence quantum yield reached to 25.19%. The fluorescence intensity can be quenched by new coccine due to the principle of IFE, and the corresponding process was decreased rapidly within 1 min. At the same time, the quenching process showed a notable linear relationship within the concentration of new coccine range from 1–100 μmol/L and 100–200 μmol/L with the detection limits of 0.33 and 0.18 μmol/L, respectively. The developed F-SiQDs were successfully adopted to the determination of new coccine in food samples, and also achieved the desired detection results after being coated on the filter-paper. This work highlights the merits of simplicity, fast response and highly selective for new coccine detection, and implements a potential avenue for the utilization of F-SiQDs in the guidance of food safety and food management.
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REACTIVE & FUNCTIONAL POLYMERS
·
2017
·
IF 3.151
Zhenfeng Huang,Runqi Liuyang,Chengyun Dong,Yufeng Lei,Anqiang Zhang,Yaling Lin
Polymeric quaternary ammonium salts (PQAS) have been widely used to prevent microbial contamination, but little is known about their activity against phytopathogenic fungi. Our previous report described the synthesis of two novel PQAS, namely a homopolymer of (2-methacrylamido) propyltetrabenzyldimethylammonium chloride (PQD-BC) and dimethylaminopropyl benzyl chloride-grafted polysiloxanes (PDMS-g-BC); we demonstrated their structure-activity relationship against phytopathogenic fungi such as R . solani and Fusarium oxysporum f. sp. cubense tropical race 4 (Foc4). Here, we analyzed the structure-activity relationship and toxicity mechanism of these compounds at the molecular level against Foc4 compared with the low molecular-weight quaternary ammonium salt benzalkonium chloride (BC). The results revealed that PQD-BC and PDMS-g-BC application inhibited the growth of Foc4 in a concentration-dependent manner and that PDMS-g-BC exhibited higher activity than PQD-BC. In addition, these polymers were found to induce cell death in Foc4 by disrupting the cellular structure integrity, such as the loss of the cell wall and plasma membrane integrity and oxidative stress (lipid peroxidation), leading to the release of intracellular contents and inducing mitochondrial dysfunction and interference with genomic DNA . The newly elucidated mechanism provides possible applications in which PQAS can be used against phytopathogenic fungi.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Wenfang Liu,Haishuang Jia,Jie Zhang,Ling Shao,Jun Wang,Dawei Fang
In this work, a novel dual-excitation and dual-emission fluorescent probe , CDs–COO–Fluorescein (CDs–COO–F), for the specific detection of hydrazine (N 2 H 4 ) was designed and synthesized through esterification reaction of carbon dots (CDs) and fluorescein (F). The prepared CDs were characterized by TEM, XPS , XRD and FT-IR and the optical properties of CDs and CDs–COO–F were described by UV–vis and fluorescence spectra. On the other hand, the affecting factors including hydrazine (N 2 H 4 ) concentration and interfering substances on the hydrazine (N 2 H 4 ) detection were researched. The high sensitivity and high selectivity of CDs–COO–F in detection hydrazine (N 2 H 4 ) could be confirmed. Two good linear responses of fluorescence emission intensities of CDs–COO–F at 462 nm and 515 nm as functions of hydrazine (N 2 H 4 ) concentration were obtained, respectively. The limits of detection hydrazine (N 2 H 4 ) were 0.504 μM and 0.269 μM under 370 nm and 480 nm excitation wavelength lights, respectively. The detecting mechanism of hydrazine (N 2 H 4 ) by CDs–COO–F was deduced from the experimental results. Cell imaging and cytotoxicity experiments of CDs–COO–F were measured. The experiment results show that the fluorescent probe CDs–COO–F can be applied to detect hydrazine (N 2 H 4 ) in aqueous solution and living cells.
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Food Science & Nutrition
·
2024
·
IF 3.5
Jialing Lin,Chuanhui Zeng,Xueli Li,Qin Tang,Jing Liao,Yan Jiang,Xianchun Zeng
Heterocyclic amines (HAs) are a group of mutagenic and carcinogenic compounds produced from the processing of high-protein foods, which include 2-amino-3-methylimidazo[4, 5-f]quinoline (IQ) showing the strongest carcinogenic effect. Camels are able to digest HAs in foods, which provide rich microbial resources for the study. Thus, camel rumen and intestinal microbiota were used to degrade IQ, and the dominant microorganisms and their degradation characteristics were investigated. After three generations of culture with IQ as the sole carbon source, the highest abundance in rumen and intestinal microbes was found in the Proteobacteria phylum. The strains of third generation of the rumen contents were mainly attributed to the genera Brevundimonas and Pseudomonas , and the dominant genera in intestine were Ochrobactrum , Bacillus , and Pseudomonas . Microorganisms were further isolated and purified from the third generation cultures. These 27 strains from the rumen (L1–L27) and 23 strains from the intestine (C1–C23) were obtained. Among them, four strains with the most effective degrading abilities were as follows: L6 (28.55% of IQ degrading rate) and C1 (25.19%) belonged to the genus Ochrobactrum , L15 (23.41%) belonged to the genus Pseudomonas , and C16 (20.89%) were of the genus Bacillus . This study suggested the application of abundant microbial resources from camels' digestive tract to biodegrade foodborne toxins.
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ULTRASONICS SONOCHEMISTRY
·
2025
·
IF 9.7
Silei Zhang,Qingbo Huang,Xiangmin Kuang,Chaofan Guo,Yongli Jiang,Fujie Zhang,Daihong Pan,Ming Du,Sakamon Devahastin,Junjie Yi
Conventional pretreatments of star anise ( Illicium verum Hook. f.) often result in uneven color development, long drying duration and substantial aroma losses, hence limiting final product quality and market value. To address these issues, the present study hypothesized that ultrasound-assisted electrolyzed water thawing (UEWT) as pretreatment prior to drying could accelerate drying and enrich flavor of star anise by inducing appropriate structural and biochemical changes. The effects of UEWT were compared with those of deionized water thawing (DWT), electrolyzed water thawing (EWT), ultrasound-assisted deionized water thawing (UDWT), and hot water blanching (HWB), with a focus on drying kinetics, microstructure, relevant enzyme activities, antioxidant activities and volatiles composition of star anise were evaluated. UEWT reduced drying time to 8 h, with the highest drying rate (0.75 kg/(kg·h)), free water content (48 %) and oil-associated NMR signal (23 %). Enhanced cell disruption enhanced moisture migration and volatiles release, while elevated PPO and POD activities intensified desirable coloration ( a* = 27.3; Δ E = 26.8); antioxidants retention was nevertheless compromised (phenolics 45.94 mg GAE/g; flavonoids 2.35 mg GAE/g). UEWT also resulted in the highest content of trans -anethole (1100.40 μg/kg) and formation of α-terpineol, both of which are key contributor to characteristic aroma of star anise. These findings demonstrate that UEWT effectively balances drying rate, color formation, and aroma retention, offering a practical pretreatment for quality-oriented drying of spice fruits. Future studies should optimize ultrasonic parameters and evaluate industrial-scale integration for continuous spice processing.
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Zhihua Zhao,Shixin Ma,Yao Wang
Hydrogen sulfide (H2S), a characteristic byproduct of sulfur-containing amino acid decomposition during fish spoilage, serves as a critical freshness indicator and poses substantial food safety risks. This study develops a novel H2S gas sensor using a ZnWO4/f-MWCNTs nanocomposite synthesized via one-step hydrothermal method. The incorporated functionalized multiwalled carbon nanotubes (f-MWCNTs) improve the sensing material’s conductivity, dispersion stability, and gas adsorption capacity. XRD, XPS, FTIR, SEM, TEM, and BET analyses verify the composite’s successful synthesis and optimal physicochemical properties. The ZnWO4/f-MWCNTs sensor demonstrates exceptional H2S detection at 120 °C, achieving a response value of 18.67 (Ra/Rg) to 50 ppm of H2S with fast response/recovery times (14 s/30 s) and excellent selectivity against interferents. Real-time monitoring of fish spoilage further confirms its practical utility, highlighting the sensor’s potential for meat freshness assessment and food safety applications.
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 1
·141-148
·
IF 14.511
Juhong Lian,Kengo Shibata,Yejun Xiao,Shiwen Du,Toshiya Tanaka,Yu Qi,Osamu Ishitani,Kazuhiko Maeda,Zhaochi Feng,Fuxiang Zhang
To efficiently utilize solar energy and catalyze the water splitting reaction under visible-light, a novel strategy of first nitridation and subsequent calcination post-treatment methods is developed to prepare N,F-codoped TiO2 (TNOF) photocatalysts in this work. The prepared sample exhibits obvious band-to-band absorption with an edge up to ca. 580 nm. After calcinating the nitrided sample at low temperature in air, the Ti3+ defects, which could trap photo-generated electrons during photocatalysis, would be significantly reduced. Under visible-light irradiation, the TNOF photocatalyst presents excellent water oxidation performance in AgNO3 aqueous solution or Fe3+ reversible electron acceptor. Based on the obtained TNOF sample, an efficient Z-scheme water overall splitting system is successfully constructed combining with a known Ru/SrTiO3:Rh H2-evolution photocatalyst. Moreover, the TNOF photocatalysts also show good visible-light-driven water reduction and CO2 reduction activities. This work presents a novel strategy to prepare nitrogen-incorporated oxide photocatalysts with low defect concentrations for photocatalytic applications.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Meng-Juan Yang,Shu-Yu Tang,Yan-Ran Weng,Feng Zhou,Yu Shi,Yong-Ju Bai,Yong Ai
Hybrid organic–inorganic perovskites (HOIPs) have emerged as multifunctional materials with remarkable optical and electronic properties. In particular, 2D-layered lead iodide-based HOIPs possess great practical application potential in the photoelectric field. In this work, we report H/F substitution-induced 1D-to-2D increment of lead iodide HOIPs. The enantiomeric HOIPs, S- and R-FPPbI3 (FP = 3-fluoropyrrolidinium), were achieved by monofluoride substitution on the spacer cations of the parent HOIP, PyPbI3 (Py = pyrrolidinium), showing mirror image structural relationship and reversible solid-state phase transition. A 2D-layered HOIP, (DFP)2PbI4 (DFP = 3,3-difluoropyrrolidinium), was achieved with a low band gap of 2.09 eV through difluoride substitution, thanks to the expansion of the Pb–I network from 1D to 2D. This work highlights the exploration of 1D chiral and 2D-layered HOIP materials with reversible phase transitions through H/F substitution strategies.
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CRYSTENGCOMM
·
2019
·Vol. 21
·期 34
·5059-5066
·
IF 3.382
Zenghui Yue,Huangjie Lu,Zijian Li,Shangyao Guo,Junze Song,Yiming Ren,Yu-Ying Huang,Jian Lin,Jian-Qiang Wang
The exploration of the family of f-element bearing single-molecule coordination polymers via solvothermal reactions yielded fourteen new rare-earth single-molecule complexes with three distinct phases, Ln(TPTZ)(NO3)3CH3CN (LnTPTZ-1, Ln = Pr and Nd), [Ln(TPTZ)(NO3)3(H2O)]·CH3CN (LnTPTZ-2, Ln = Pr–Er), and [Ln(TPTZ)(NO3)3(H2O)]·2CH3CN (LnTPTZ-3, Ln = Tm–Lu), as well as a uranyl coordination polymer UO2(TPTZ)(NO3)2 (UTPTZ). All of the structures exhibited zero-dimensional topologies due to the self-assembly of f-element cations with 2,4,6-tri-α-pyridyl-1,3,5-triazine (TPTZ), a tridentate semiaperture ligand featuring three ortho-N atoms on its pyridine and triazine rings. Due to the effect of lanthanide contraction, the structural evolution of the lanthanide complexes, including decrease in the unit cell dimensions and Ln–O/N bond lengths across the isomorphic structures, and more dramatically, transitions in the overall topology, was observed. In addition, a rather unusually bent OylUOyl unit with a highly distorted hexagonal bipyramid coordination environment was identified in UTPTZ. The homoleptic structures of EuTPTZ-2 and TbTPTZ-2 allowed the fine-tuning of the molar ratio Eu/Tb in a single EuxTb1−xTPTZ-2 complex, concomitantly giving rise to versatile photoluminescent colours in such materials. Explicitly, it exhibited multicolour photoluminescence ranging from green to red under the excitation of UV light, and an excellent linear relationship between chromacity coordinates and colour tunability could be obtained.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Daoyan Feng,Yu Liu,Chen Zhao,Han Su,Xia Kong,Yu Zhong,Junzhang Wang,Zhou Xu,Xiuli Wang,Xingzhong Guo,Jonghee Lee,Jiangping Tu
Achieving a stable interface between sulfide solid-state electrolytes (SSEs) and high-voltage Ni-rich oxide cathodes is crucial for enhancing the electrochemical performance of all-solid-state batteries (ASSBs). However, addressing the interface challenges through surface coating modifications remains a significant hurdle. In this work, a straightforward modification approach is proposed to achieve a highly stable interface by surface dual doping of Zr and F in LiNi 0.83 Co 0.12 Mn 0.05 O 2 (NCM83) cathodes via acid washing followed by annealing. First-principle calculations demonstrate the thermodynamic stability of Zr-F doped NCM83, effectively inhibiting the formation of unfavorable interfaces with decomposition products. The modified NCM83-1% ZrF cathode exhibits exceptional long-cycle stability, retaining 85.1% of its capacity after 1000 cycles at 0.5C rate. This simple and scalable modification strategy offers a new perspective for the design of high-performance sulfide-based ASSBs.
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COMBUSTION AND FLAME
·
2025
·
IF 6.2
Xiandie Zhang,Haozhe Li,Xuxu Cui,Xinwen Ma,Jiaming Liu,Xiaode Guo,Xiang Zhou
The passivation layer of Al powder hinders the mass transfer during Al combustion. Fluorinated oxidants, such as metal fluorides and fluoropolymers, substantially improve the combustion behaviour of Al powder. Herein, a simple solvothermal method is employed to produce a high-entropy acicular accumulational fluorine-containing oxidiser based on ammonium fluoroferrates. The characterization results indicate that heating the fluorine-containing oxidiser can release gaseous products of HF and NH 3 . HF etches the passivation layer, and NH 3 provides kinetic energy to the fuel, resulting in multiple hot spots and secondary combustion as well as prevention of reaction sintering. Compared with traditional FeF 3 , this novel fluorine-containing oxidiser considerably improves the combustion of Al powder by reducing its onset temperature as well as increasing its exothermic enthalpy, flame area and F release ability.
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